Method of treating paper



Feb; 16, 1932. l P. A. GOLLNICK 1,846,003

METHOD OF TREATING PAPER Original Filed June 15, 1928 Patented Feb. 16, 1.932

i PATENT OFFICE UNITED STATES PAUL A. GOLLNIGK, OI' CHICAGO, ILLINOIS, ASSIGNOR TO SELECTOGRAIPH COMPANY,

OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS METHOD OF TBATING PAPER A@riginal application led June 15, 1928, Serial No, 285,747. ,Divided and this application filed September 1a, 1929. serial No. 392,113;

rThis application is a divisionA of one tiled d une 15, 1928, Serial No. 285,747.

The main objects of this invention are to provide an improved method of coating por- :i ous sheet material; and to provide an improved method of impregnating Japanese yoshino paper with a liquid in the manufacture ot stencil sheets.' y

An illustrative embodiment of the means 1o for carrying out this improved process is shown in the accompanying drawings, wherein Figure 1 is a top plan of an improved coating tank showing a sheet lioating on the surface of the bath.

Fig. 2 is a side elevation of the same.

Fig. 3 is a section taken on the line 3 3 of Figure 1, the dotted outline representing the raised position of the Contact element.

F ig. l is a longitudinal section of the tank taken on the line 4-,4 of Fig. 1, the dotted outline representing the position of the sheet as it is withdrawn through the wiping mechanism.

Q5 Stencil sheets for use in connection with addressing machines and analogous printing devices are generallyr made of porous sheet material, such as Japanese yoshino paper, impregnated with a substance impervious to 3 ink to form a coating in which the stencil characters are cut to permit the ink to print through the fibers of the paper.

Heretofore, in the manufacture of stencil sheets, the coating-has been applied to the sheet by a brush or spraying device or by im- I mersing the entire sheet in a bath. Scrapers have also been used for wiping the surplus liquid. from the coated side or sides of the sheet, but the Scrapers of prior devices were not employed for effecting a penetration of the iiquid into the paper.

Applying thel coating to the sheets by the spraying or brushing process is objectionable because of the time consumed and the dilu culty in handling the sheets during the application of the liquid. The dipping process is objectionable because of the flimsy characvter of the yoshino paper.

If Japanese yoshino paper .is oated on a liquid bath for coating the lower surface of the sheet, ,the liquid will in time penetrate the sheet so as to coat the upper side also.

' However, when thus coated, the sheet is unsatisfactory because the coating is not uni- 'form on both sides of the sheet and does not properly bind the fibers of the paper. Stencils coated in that manner make impressions having what is known in the trade Yas a feather edge?. The letters and numerals which are printed from those stencils are ragged and not clearly defined.

The aforementioned objections to processes heretofore in use are cured by this improved process which consists in applying a liquid to only one side of the sheet and then applying a Contact element to the other side thereof to rupture the surface tension of the liquid, thereby causing the liquid to penetrate the sheet for coating the opposite side thereof.

In carrying out this improved' process, the liquid film is applied to only one side of the yoshino paper, preferably by floating the sheet on the surface of a 'bath of the liquid and then,.as the sheet is being withdrawn from the bath, applying a contact element to the upper surface thereof.

In the form shown, the'means for carrying out this improved process comprises a tank 1, adapted to contain a bath 2 of the liquidA for treating porous sheets v3, and having a wiping mechanism 4 adjacent one end thereof, through which the sheets are drawn after being floated on the surface of thel bath.

The tank 1 may be made of any suitable 4 size and shape and is seated in a water jacket 5, through which warm water flows for keeping the bath at a certain temperature. The' jacket 5 has-an inlet conduitf and a drain 7. In the construction illustrated, the wiping mechanism 4 comprises a pair of stationary supporting rods 8 and 9 and a movable-convtact element 10.

The rod 8 is rigidly secured to the -sidev walls of the tank 1 and the rod 9 is rigidly 5 mounted on a pair of brackets 11 secured to respectively opposite sides of the tank 1 adjacent the rod 8. The'rods 8 and 9 span the tank 1 and are disposed in spaced relation to each other to form a support, over which the lower film coated surface of the sheet is wiped as the sheet is Withdrawn fromjche bath.v

The rods 8 and 9 are arched toward the opposite end of the tank, so as to spread each sheet to smooth out the Wrinkles as the sheet is wiped over the rods.

The contact element 10 .comprises a rod having a mounting 12, which is pivotally secured to an 4arml?, formed on one of the y, ,29 brackets 11, so as to permit the' contact ele-v causing the liquid to penetrate the sheet for coating the opposite side thereof.

2. The method of 'coating a porous sheet of Japanese yoshino paperlfor use in making stencils 4which consists in placing the sheet on the surface of aliquid bath to apply a liquid film to only one side of the sheet, and then' removing the sheetfrom simultaneously wiping the other side thereof for bjreaking the surface tension of the liquid and thereby causing the liquid to penthe bath land etrate the sheet for coating the opposite side thereof.

Signed at `Chicago thijs9th day of Sept.,

i, 4 PAUL A. GOLLNICK.

mentto move into notches 14 formed in the brackets 11 for engaging the top surface of a sheet supported on the rods 8 and 9.

Mounted on Athe outer` end of the rod 10,

is a counterweightlwhich normally holds the free. end of the rod its raised or open position. The rod 10 is also arched, so as to conform to the rods `8 and 9.

In operation, a sheet 3 1s secured at` one 3 end to a' suitable clamp 16, which is held in one hand of the o erator. The sheet is then placed on the sur ace ofthe bath, so that the lower surface of the sheet becomes coated with afilm of the liquid. The sheet is then d rawn edgewise land the forward end thereof is lifted out of the bath and placed over the rods 8 and 9.

The rod 10 is then lowered into the recesses 14, so as tocontact with the upper surface 4 of the'sheet and, while the rod 10 is held in its lowered position, the sheet is wiped through the rods. The lower rods 8 and 9 remove the sur lus liquid from the lower surface of the s eet and the contact rod 10' Y breaks the 4sur-face-tension of the film, there` by causing the liquid to penetrate the sheet for uniformly coating the top` surface thereof. Y

A sheet which is coated with this improved o method is very satisfactory for stencil purposes because the fibers are firmly bound by the 'uniform coating on both sides of they sheet. Y

It is to be understood that numerous de- 5.5 tails of the construction shown and steps in the -processM described may be varied without departing from the spirit of this invention as'defined by the following claims I claim:

1. The method of coating a porous sheet of Japanese yosbino paper in the manufacture of stencils which consists in applying a liquid to only one sideof the sheet, and them p wiping the other side thereof for breaking the surface tension of the liquid and thereby 

